/* HB-UPM Flight & Fuel Log Modern Design System */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Palette */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --primary-text: #0369a1;
  
  --success: #10b981;
  --success-light: #ecfdf5;
  --success-text: #047857;
  
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --warning-text: #b45309;
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;
  --danger-text: #b91c1c;

  --accent-slate: #1e293b;
  --accent-indigo: #6366f1;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Top Navigation */
.app-header {
  background: var(--accent-slate);
  color: #ffffff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand-badge {
  background: linear-gradient(135deg, #38bdf8, #0284c7);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.08);
  padding: 4px 12px 4px 6px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  font-weight: 600;
  color: #e2e8f0;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* Layout Containers */
.main-content {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Stat Cards Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.stat-icon.fuel { background: var(--primary-light); color: var(--primary); }
.stat-icon.oil { background: var(--warning-light); color: var(--warning-text); }
.stat-icon.landings { background: #e0e7ff; color: var(--accent-indigo); }
.stat-icon.passengers { background: var(--success-light); color: var(--success-text); }

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Tables & Wrapper */
.card-table-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.custom-table th {
  background: #f8fafc;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.custom-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  vertical-align: middle;
  font-variant-numeric: tabular-nums;
}

.custom-table tr:last-child td {
  border-bottom: none;
}

.custom-table tbody tr {
  transition: var(--transition);
}

.custom-table tbody tr:hover {
  background-color: #f1f5f9;
}

.pilot-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.pilot-initial {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #e2e8f0;
  color: var(--accent-slate);
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  font-weight: 700;
}

.metric-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
}

.metric-fuel { background: var(--primary-light); color: var(--primary-text); }
.metric-oil { background: var(--warning-light); color: var(--warning-text); }
.metric-landings { background: #e0e7ff; color: #4338ca; }
.metric-pax { background: var(--success-light); color: var(--success-text); }

/* Forms & Authentication Cards */
.auth-wrapper {
  min-height: calc(100vh - 140px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.auth-card, .form-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  width: 100%;
  max-width: 440px;
}

.form-card.wide {
  max-width: 640px;
}

.auth-header {
  text-align: center;
  margin-bottom: 24px;
}

.auth-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.auth-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
}

.auth-subtitle {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-family);
  font-size: 0.95rem;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.input-suffix {
  position: absolute;
  right: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

textarea.form-control {
  min-height: 90px;
  resize: vertical;
}

/* Form Grid Rows */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Quick Action Date Buttons */
.date-quick-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.btn-quick {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-quick:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background-color: #f1f5f9;
  color: var(--text-primary);
}

.btn-danger {
  background-color: var(--danger-light);
  color: var(--danger-text);
  border-color: #fca5a5;
}

.btn-danger:hover {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* Alert Notifications */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-error {
  background-color: var(--danger-light);
  color: var(--danger-text);
  border: 1px solid #fca5a5;
}

.alert-success {
  background-color: var(--success-light);
  color: var(--success-text);
  border: 1px solid #6ee7b7;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 20px 16px;
  color: var(--text-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  margin-top: auto;
}

/* Filter Bar for Reports */
.filter-bar {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.select-control {
  padding: 8px 12px;
  font-family: var(--font-family);
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
}

.select-control:focus {
  outline: none;
  border-color: var(--border-focus);
}

/* Total Highlight Row */
.total-row td {
  background-color: #f8fafc;
  font-weight: 700;
  border-top: 2px solid var(--border-color);
}

/* Responsive Rules */
@media (max-width: 768px) {
  .header-container {
    height: auto;
    padding: 12px 16px;
    flex-direction: column;
    gap: 12px;
  }
  
  .nav-menu {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}